JPH05176618A - Lawn mower - Google Patents

Abstract

PURPOSE:To make it possible to directly grind a blade of a lawn mower without detaching the blade of lawn mower. CONSTITUTION:The objective lawn mover comprises a reel having a gear 9 at one end and equipped with a horizontally supported blade 3 and round rod grindstone 5 having a gear 10 at one end, horizontally supported and pressed in the direction which goes away from the reel 4 and when the round rod grindstone 5 is brought into contact with the blade 3 of the reel 4, the above- mentioned gears 9 and 10 are mutually engaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lawn mower for cutting overgrown lawns such as lawn gardens, parks and golf courses.

[0002]

2. Description of the Related Art A turf is cut by driving a reel that is supported horizontally and has a blade around it with a motor.
The reel type lawnmower having the appearance as shown in FIG. 2 has been widely used from the past.

[0003]

In the above lawnmower, the blade of the reel may not be cut immediately and the lawn may become entangled in the reel and become difficult to move. Further, in order to grind an uncut blade, it is necessary to remove it and request the manufacturer to grind it, and the labor and cost therefor are not negligible.

An object of the present invention is to provide a lawnmower which can be ground as it is without removing a blade.

[0005]

In order to achieve the above object, a lawn mower according to the present invention has a reel with a blade that has a gear at one end and is supported horizontally, and a reel that has a gear at one end and is horizontal. It is composed of a round bar grindstone which is supported and biased in a direction away from the reel, and the gears mesh with each other when the round bar grindstone is brought into contact with the blade of the reel.

[0006]

[Operation] In the lawnmower configured as described above, when the whetstone of the round bar is brought into contact with the blade of the reel against the force biased in the direction away from the reel, The gears fixed to one end mesh with each other, the rotational force of the reel is transmitted to the round bar grindstone and rotated, and the blade of the reel is sharpened.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lawnmower of the present invention will be described with reference to FIGS.

This lawnmower comprises a caster 11, a removable shavings container 12, a reel 4 supported between side frames 1 and 2 of a main body having a hand pushing frame 13, and a blade 3 supported by the reel 4. , A bar whetstone 5 supported between the main body side frames 1 and 2
Etc.

The reel 4 is fixed to a horizontal shaft 6 fitted and supported by the main body side frames 1 and 2, and the horizontal shaft 6 is driven by a motor M fixed to the main body side frame 1. Although not shown in FIG. 1, the power transmission means is a gear,
Anything such as a timing belt (transmission belt with teeth) can be used. Further, the reel 4 may use the force by which a person pushes the hand pushing frame 13 regardless of the motor.

The blade 3 is fixed to the reel 4 in a state of being twisted with respect to the horizontal shaft 6, and its blade edge is directed outward in the tangential direction of the reel 4 and forward in the rotation direction. Therefore, the positional relationship between the tip of the blade 3 and the round bar grindstone 5 during polishing, which will be described later, becomes an angle convenient for polishing.

The round bar grindstone 5 is a round bar body in which abrasive grains obtained by crushing artificial abrasives are combined with a binding material, and is freely rotatable on the upper support walls 1a, 2a of the main body side frames 1, 2. It is rotatably supported by the round bar grindstone mounting frame 7 supported by.

The round bar grindstone mounting frame 7 is rotatably supported by the support walls 1a and 2a by a support shaft 7a, and is urged clockwise (to the rear of the lawnmower) by an appropriate spring (not shown). Usually, it is located away from the blade 3 of the reel 4. A handle 8 for rotating the round bar grindstone mounting frame 7 counterclockwise (in front of the lawn mower) is fixed to the central plate 7b of the round bar grindstone mounting frame 7. ing.

One end of each of the horizontal shaft 6 and the round bar grindstone 5 extends outward from the main body side frame 1, and a gear 9 and a gear 10 are fixed to the respective ends. Also, the main body side frame 1
Is provided with a long hole 1a 'for moving the shaft of the round bar grindstone 5 when the round bar grindstone 5 is rotated to a position in contact with the blade 3.

In the lawnmower having such a structure, when the handle 8 is raised in front of the lawn mower against the force of the spring, the round bar grindstone mounting frame 7 is rotated counterclockwise around the support shaft 7a. The circular rod grindstone 5 also moves to rotate to a position where it comes into contact with the blade 3, and the gear 10 meshes with the gear 9. Then, the driving force of the motor M is transmitted to the round bar grindstone 5 via the gears 9 and 10, and the round bar grindstone 5 rotates in the opposite direction to the reel 4 and the blade 3. At this time, since the gear 10 is smaller than the gear 9, the round bar grindstone 5 rotates at a higher speed than the blade 3, and the blade 3 is ground by the round bar grindstone 5.

[0015]

Since the present invention is constructed as described above, it has the following effects.

That is, anyone can easily sharpen the blade without removing it from the main body. Therefore, unlike the conventional one, the labor and cost for requesting the polishing to the manufacturer are not required, which is economical.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a lawnmower according to the present invention.

FIG. 2 is a perspective view of a lawnmower.

[Explanation of symbols]

 1 Main body side frame 2 Main body side frame 3 Blade 4 Reel 5 Round bar grindstone 7 Round bar grindstone mounting frame 9 Gear 10 Gear

Claims (1)

[Claims] 1. A round bar comprising a reel having a gear at one end and horizontally supported and having a blade, and a round bar grindstone having a gear at one end and horizontally supported and biased in a direction away from the reel. A lawn mower in which the above gears mesh when the whetstone is brought into contact with the blade of the reel.